Bhagavad Gita Verse 21, Chapter 10

aadityaanaamaham vishnurjyotishaam raviranshumaan |
mareechirmarutaamasmi nakshatraanaamaham shashee || 21 ||
 
Among the Aadityaas I am Vishnu, among the bright objects I am the radiant sun, among the Marutas I am Mareechi, among the stars I am the moon.
 
aadityaanaam : among the Aaadityaas
aham : I
vishnuhu : Vishnu
jyotishaam : among the bright objects
ravihi : sun
anshumaan : radiant
mareechihi : Mareechi
marutaam : among the Marutas
asmi : am
nakshatraanaam : among the stars
aham : I
shashee : moon
 
Shri Krishna begins enumerating Ishvara’s expressions in this shloka. He begins by saying that among the Aadityaas or the sons of Aditi, he is Vishnu. The twelve sons of Aditi were Dhaataa, Mitra, Aryamaa, Rudra, Varuna, Soorya, Bhaga, Vivasvaan, Poosha, Savitaa, Tvashtaa and Vishnu. Vishnu also refers to the Vaamana avatar.
 
Next, Shri Krishna says that Ishvara is “Ravi”, the sun, among all the bright objects in the universe. He uses the word “anshumaan” meaning radiant to describe the sun. So whenever we see the brilliance of the sun, our mind should immediately go towards the might of Ishvara that is shining through the sun. And just like Ishvara’s luminosity is present in the sun during the day, it is present in the moon during the night.
 
There is an episode in the Sunder Kand of the Tulsi Ramayana where Lord Hanumaan was captured bound with ropes in Lanka. It is said that there are forty nine types of wind deities known as Marutas. Hanumaan was the son of the lord of wind, Vayu. When all forty nine types of winds began to blow, he untied himself of all the ropes and flew from building to building, burning each one with his flaming tail. Shri Krishna says that Mareechi, the prominent among the Marutas, is Ishvara’s expression.
 
With these expressions in our mind, we will never be disconnected from Ishvara. In the day, we can look at the sun - it is Ishvara. When the winds blow, it is Ishvara. In the night, the moon is Ishvara.